We also distill some solvents over sodium (THF), and in some cases I think CaH is used (for acetonitrile). Also, for commonly used solvents, such as methylene chloride, ether, THF, and toluene, we have a solvent system set up that passes the solvents over an alumina column that dries them. That system is not quite as easy to set up as a thermal still with Na, Ca, or CaH though.